considering enduro bearings are supposed to be ‘bike specific’ ( aren’t they? ), they don’t put a lot of grease in them. it’s almost like they’re manufactured by a generic factor…
Two things you need to bear in mind about most ‘sealed’ bearings on bikes:
1) They’re NOT sealed. No other industry calls them ‘sealed’ bearings, they correctly call them cartridge bearings.
2) For any bearing to run reliably for a long period, there needs to be a sufficient amount of suitable and uncontaminated grease in there. Almost all cartridge bearings used in bike manufacture contain a very small amount of unsuitable grease which quickly gets contaminated through the bearing ‘seals’.
They ARE the elephant in the room of the bike industry, given the amount of grief they cause.
All that you need to do to protect almost any cartridge bearing from wear and malfunction in the longer term is to CAREFULLY whip the seals off and fill them with a decent waterproof grease, and repeat annually (or more often if you really hammer your equipment or run it in very wet conditions). Carefully replace the seals and all should be well. I use Phil Woods waterproof grease.
The above may or may not apply to ceramic cartridge bearings, I’ve never used them.